Through the wonders of the Internet, I've found this still image from the 2003 Linkin Park video for "Numb":
In the video, a young, disaffected student dreams of traveling to far-flung cities to practice her true talent - sculptural drawing. However, it seems an evil chemistry professor stands in her way.
But look behind the (hilariously stereotyped) man with the chalkboard pointer. NaK...as an alloy, perhaps? And how come there's a subscript number before the nitrous acid?
If that were my science teacher, I'd feel "numbed" by his complete lack of chemistry education.
See Arr Oh